Rock-drill.



S. W. BROTHERS.

ROCK DRILL.

APPLIOATION IILED AUG. 21, 1908.

Patented Nov. 29, 1910.

S. W. BROTHERS.

ROCK DRILL.

APPLICATION FILED AUG. 21, 1908.

Patented N0v.29, 1910.

4 SHEETS SHEET 2.

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S. W. BROTHERS.

ROCK DRILL.

APPLICATION FILED AUG. 21,}908.

976,98 1 Patented Nov. 29, 1910.

4 SHEETS-SHEBT 3.

NiTED STATES PATENT. OFFICE.

SANFORD W. BROTHERS, OF DENVER, COLORADO.

Rock-DRILL.

Specification of Letters Patent. PatentedNov, 29, 1910,

Application filed August 21, 1908. Serial No. 449,651.

To all whom it may concern:

Be it known that I, SANFORD W. BROTH- nns, a citizen of the United States, residing,

in the city and county of Denver, State of Colorado, have invented certain new and useful Improvements in Rock-Drills; and I do declare the following to be a full, clear,

deliver it to the hollow drill'bit or steel which is exposed to the direct action of the hammer, and at the same time protect the tappet extremity of the steel from the upsetting action of the hammer. complish this result, I surround'the rear extremity of the drill steel with a reinforcing or protecting ring which occupies a position just forward of the rear extremity of the steel, the latter being cone shaped or tapered toward the rear to engage the said protecting ring.

Other features of the construction include special means for rotating the drill bit, the rotating constructionharmonizing with the aforesaid features.

Having briefly outlined my improved construction, I will proceed to describe the same in detail, reference being made to the accompanylng drawing in which is illustrated an embodiment thereof.

- In this drawing, Figure 1 is aside elevation of a drill equipped with my-improved construction. Fig. 2 is a top plan view of the same. Fig. 3 is a detail view illustrating thewater delivery tube and the'valve' mechanism located at the rearextremity thereof for ntrolling the passage of waterv thereto the E atter being shown in cross-section. Fig. 4 is a side elevation partly in section, of they drill steel chuck or holder.

Fig. 5 is an end elevation of'the same beinga view looking in the directionof arrow 5 Fig. 4. Fig. 6 is a vertical section taken through the' complete drill. Fi 7 is a sectional view in detail of the ring or reinforcing or protecting the tappet extremity of the In order to ac-.

drill steel. Fig. 8 is a face View of the same, or a view looking in the direction of arrow 8, Fig. '7. Fig. 9 is a fragmentary sectional view of the forward portion of the drill mechanism, similar to Fig. 6, the parts being shown on a larger scale. Flg. 10 is a detail view of a sleeve whose forward extremity is interlocked with the chuck when the parts are assembled for the purpose of rotating the drill bit, its rear extremity'having bushing which surrounds the hammer and is connected to rotate therewith, thereby imparting the necessary rotary movement to the sleeve, the drill chuck and consequently, to the drill steel. Fig. 11 is an end elevation of the construction shown in Fi' 10 being a View looking in the direction of arrow ll'Fig. 10. 1

The same reference characters indicate the same parts in all the views.

Let thenumeral 5 designate the body of the drill casing which is provided with a chamber 6, in which reciprocates thestr'iking hammer 7, the latter being actuated by Z a suitable fluid, the passage of the said fluid to the said chamber for the purpose of reciprocating the hammer being controlled by a valve mechanism 8, comprising a casing 9, a valve 10 and end screw lugs 12. The body of the drill casing is provided with passages 13 which are alternately utilized as motive fluid delivery and exhaust passages. As nothing is claimed in this application upon the valve mechanism for controlling the motive fluid, this construction will not be described more in detail.

The rear extremity of the body 5 of the casing is closed bya cap 14, while to the forward extremity of the casing 5, isapplied an auxiliary-casing member 15, the j rear extremity of the latter vbeing reduced jas shown at 16 and provided with a shoul- 'der :17 which is engaged by the forward extremit of the casing member 5. The cap 14 an ,the auxiliary casing member 15, are

ing the hammer, during its reciprocating movement. In the rear of the hammer chamber is located yielding buffer which is engaged in the front and rear by metal plates 56 and 57 respectively. Forward of the main'portion of this hammer chamber the mechanism is also provided with a yielding buffer 49, reinforced on opposite sides by metal plates or washers 50 and 51.

Inclosed by the forward or auxiliary casing member 5, is a sleeve 26 in whose rear extremity is threadeda bushing 27, whose inner surface is polygonal in shape, being provided with a number of flat faces 28 (see Fig 11) which engage correspondingly shaped surfaces formed upon the forward portion 29 of the hammer, whereby as the hammer rotates, by virtue of its connection with the rifle bar, the sleeve 26 is also rogage the protecting tated. The forward extremity of this sleeve (see Figs. 10 and 11) is provided with a number of open slots or recesses 30, adapted to receivelugs 31 of counterpart shape, with which the chuck 32 is exteriorly provided. This chuck is polygonal in shape interiorly to fit the drill steel 33, whereby as the chuck parted to the steel.

The rear extremity of the drill steel is beveled, being cone shaped as shown in 34',

.its rear extremity beingsmallest in diameter.

This cone shaped drill steelextremity is surrounded by a ring 35 which the cone shaped extremity of the drill steel fits. The rear end of the drill steel projects slightly beyond this rin whereby it is exposed to the striking action of the forward end of the hammer, which, however, does not enring 35, This ring, however, by its rein rcing or strengthening action, prevents the upsettmg of the rear extremity of the drill steel and makes it prac ticable to have the latter directly exposed to the striking action of the hammer.

The drill steel is hollow, or provided with 1 a longitudinal passage 36, which is in alinement with the corresponding passage 37 formed in the hammer. The rifle bar and the ratchet disk are also centrally perforated "to register with the passages in the drill steel and hammer, thus making it practicable to pass a water delivery tube 38 through all of the said parts,'its forward extremity entering the rear extremity of the drill steel.

The cap 14: applied to the rear extremity 'of the casing body as aforesaid, is provided with a threaded opening into which is screwed the hollow lug 39 Whose rear extremity protrudes beyond the cap and is threaded into a valve casing 40 one extremity of which has an opening 41, controlled by a needle valve 42, for the delivery of water to the drill for the purpose of wash? ing out the drill steel cuttings. This needle From the foregoing description the use and operation of my improved drill mechamsm will be readily understood. The 1110-.

-tive fluid being delivered in the drill mechanism 8, enters the hammer chamber and imparts the necessary reciprocating movement thereto. As the hammer makes its forward stroke, it engages the rear extremity of the drill bit and actuates the latter in the performance of its rock cutting function. This rear extremity of the bit being reinforced by the ring 35, is prevented from I the ordinary upsetting action of the ham- 1S rotated a correspondlng movement 1s 1m mer. As the rock cuttings accumulatein thfdrill hole, they are removed by water or other suitable fluid introduced at the rear extremity of the drill mechanism and delivered to the hollow drill steel by the centrally located longitudinally disposed tube or conduit 38, as heretofore explained. As the hammer reciprocates, it is given the necessary partial rotary movement by virtue of its engagement with the rifle bar, the said movement being communicated to the drill steel by virtue of the connection of the chuck with the sleeve 26, which rotates with the hammer by virtue of the peculiar shape of the bushing 27, which surrounds the forward reduced portion of the hammer as heretofore explained.

Having thus described my'invention, what I claim is:

1. A rock drill comprising a cylinder, a piston hammer having an opening extending longitudinally therethrough, means for imparting a rotary movement to the piston hammer, a hollow drill steel havin a conical inner end, a pipe for delivering fluid through the piston hammer into the drill steel, a sleeve engaging the piston hammer at one end and a chuck interlocked therewith and engaging the drill steel at the opposite end whereby the rotary movement of the piston hammer is communicated to the drill steel, a ring forming a guide movable longitudinally. in the first mentioned sleeve between the chuck and piston hammer and having a conical aperture extending entirely through the same in which the conical end of the drill steel seats and through which the extremity of the drill steel projects in position to be struck by the piston hammer whereby the end of the drill steel is held against lateral movement to prevent rupture of the fluid delivery pipe.

2.. A rock drill comprising a cylinder, a piston hammer, a sleeve surrounding the lower portion of the hammer, a rear extremity of the sleeve having its interior surface polygonal in shape, and the engaging extremity of'the hammer bein ingly' shaped, a drill-steelolding-chuck whose rear extremity interlocks with the forward extremity of the sleeve, a hollow drill steel, a tube entering said hollow drill steel for 'deliverin water therethrough, and a ring surroun ing the rear extremity of said dri 1 steel which protects the same from the hammer blows and reventsany lateral movement of the drill steel and tube, substantially as described.

3. In a rock drill the combination with a cylinder, a piston hammer, a sleeve located within the cylinder and engaging the piscorrespondton hammer, the sleeve and hammer being connected to rotate in unison, a drill-steelholding-chuck havin lugs thereon and the forward extremit 0% said sleeve being provided with note es to receive said lugs, whereby the two parts are interlocked, means for rotating the hammer during its reciprocating movement, a hollow drill steel, a tube entering said hollow drill steel and delivering fluid therethrough, and a ring' surroundlng the rear extremity of the said drill steel for protecting the same from the hammer'blows and also preventing any lateral movement of the said drills steel and tube, substantially as described.

In testimonfy whereof I afi'ix my signature 1n presence 0 two witnesses.

SANFORD W. BROTHERS.

Witnesses:

A. J. OBRIEN, LOUISE COSNER. 

